using two potential together

thanks very much, but i had used your suggestion before that i sent my first email for lammps’s mail list.
the tersoff potential is a force field model for interaction between 3 or 4 particles, but LJ potential is an interaction between 2 particles ,and due this , the coalescence of this two potential by “pair_style hybrid” command, terminates to an error. this is my problem!!
i do not know whether you can help me with a script or etcetera?
i thanks for your attentions,actually.

Please post the lines from your input script for
the pair_style and coeff commands. And
the error message LAMMPS produces.